package com.zyj.exam_app.interceptors;

import com.zyj.exam_app.context.UserContext;
import com.zyj.exam_app.login.bean.LoginInfo;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 登录拦截器，确认用户是否登录
 */
public class LoginInterceptor implements HandlerInterceptor {
    /**
     * 目标方法执行之前
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String requestURI = request.getRequestURI();
        System.out.println("请求路径：" + requestURI);

        String contextPath = request.getContextPath();
//        log.info("preHandle拦截的请求路径是{}",requestURI);

        LoginInfo loginInfo = UserContext.getCurreentUser();
        if(loginInfo != null){
            return true;
        }
        else {
            //拦截住。未登录。跳转到登录页
            request.setAttribute("msg","请先登录");
            request.getRequestDispatcher("/login").forward(request,response);
            return false;
        }
    }

    /**
     * 目标方法执行完成之后
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    /**
     * 页面渲染以后
     * @param request
     * @param response
     * @param handler
     * @param ex
     * @throws Exception
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }

}
